In what important ways does the world view of the Beowulf poet differ from that of his characters?
This is a rather impossible question to answer. The epic poem of Beowulf is not ascribed to any specific author. The poem was originally written between 675 and 1000 AD. That said, the original tale existed as a spoken or sung tale. The true original has changed so mush from the original (presumably) given that each scop (singer) most likely added his own personal interpretations to the one he heard. These epics were sung often, and one could only assume that the story changed slightly each time it was "performed."
Therefore, it would be impossible to suggest that the beliefs of the author and characters differed in any way given we (as readers and historians) cannot name the original author. All we can assume is that the author used his own beliefs of his society to create the characters within Beowulf.